Spark-plug.



W. ELLIS.

SPARK PLUG.

APPLIUAMON rLrzD un 12. 1911.

Patented Apr. 23, 1912.

WILLIAM ELLIS, 0F HARROD, OHIO.

SPARK-PLUG.

Specification of Letters Patent.

Patented Apr. 23, 1912.

Application led May 12, 1911. Serial No. 625,713.

To all whom 'it mayy concern;

Be it known that I, VVILLIAAI ELLIS, a citizen of the United States,`residing at Harrod, in the county of Allen and State ol Ohio, haveinvented new and useful Improvements in Spark-Plugs, of which thefollowing is a specification.

This invention relates to spark plugs for internal combustion engines,and it has for its object to provide a simple and improved constructionwhereby the plug is provided with two separate and independent sparkingdevices, properly insulated 'from each other and so arranged that in theevent of one of said devices being disabled, the sin ple adjustment of aswitch will enable the other unit of the sparking device to be throwninto active operation so that the operation of the engine with which thedevice is associated may be continued without interruption, theinstalment of a new sparkA ing device being postponed until a moreconvenient season.

With these and other ends in view which will readily appear as thenature of the invention is better understood, the same consists in theimproved construction and novel arrangement and combinat-ion of partswhich will be hereinafter fully described and particularly pointed outin the claims.

yIn the accompanying drawing has been illustrated a simple and preferredform of the invention, it being, however, understood that no limitationis necessarily made to the precise structural details therein exhibited,but that changes, alterations and modications within the scope of theclaims may be resorted to when desired.

Inr the drawing-Figure 1 is a view in elevation of the improved sparkplug. Fig. 2 is a vertical sectional view of the same. Fig. 3 is a sideelevation of the switch used in connection therewith.

Corresponding parts in the several figures are denoted by likecharacters of reference.

The casing 1 of the improved spark plug is externally threaded at 2 forengagement with the engine head3, and said casing is provided with awrench seat 4 to enable it to be conveniently adjusted and tightened.

The u )er or outer end of the casin lconstitutes a packing box for thereception of packing 5 which is retained by means of a gland 6 oiordinary construction. The lower end of the shell or casing 1 isprovided with inwardly extending prongs 7, 7 constituting electrodes.

The shell contains an insulating plug 8 of porcelain or other suitablematerial, said plug being provided with a downwardly extending web 9 andwith electrodes l0, 10 extending longitudinally therethrough, saidelectrodes terminating adjacent to t-he prongs 7, 7 The upperextremities of the electrodes are provided with U-shaped brackets ll, 11adapted to be engaged by a switch lever 12 which is connected by aninsulating block 13 of porcelain or other suit-able material with aresilient supporting member 14, the latter being bolted. or otherwisesecured upon the head of the engine. The switch lever 12 has a handle 15whereby it may be conveniently manipulated and is provided with abinding post 16 for connection with the timer wire 17 whereby connectionis made with themagneto, battery or other electrical connection in anycustomary and well known manner.

It will be observed that the spark gap between the prong 7 and theelectrode l0 is entirely separated from the spark gap between t-heelectrode 7 and the prong l0 by the web 9, so that the sparking of theone set of electrodes will not injuriously altect the other set.

In the operation of this device, if the electrodes at one side of thedevice should be burned out or refuse to act, the simple switching ofthe lever 12 to the opposite bracket 1l or 11, as the case may be, willcut the first electrode from and include the second electrode in thecircuit, thus restoring the device to operativeness.

Having thus described the invention, what is claimed as new, is

l. In a spark plug, a shell having a plurality of inturned prongs at itslower end, and an insulating plug in the shell having a downwardlyextending web forming a partition between the prongs, electrodesextending through the plug, said electrodes terminating at voppositesides of the web, each electrode adapted to spark to one of the inturnedprongs, and each electrode having switch engaging means at its upperend, and a resiliently'supported switch lever to alter- -nately engagethe switch engaging means of the several electrodes.

2. In a spark plug, a shell having prongs at its lower end, aninsulating plug having a downwardly extending Web forming a partitionbetween the prongs, electrodes eX- tending through the plug at oppositesides of the Web and terminating adjacentto the prongs, each of' saidelectrodes being provided with switch engaging means at its upper end,av resilient supporting member, ay switch lever, an insulating blockconnecting t-he switch lever with the supporting 10 member, said leverbeing adapted for alternate engagement with the electrodes, and abinding post and a handle uponthe switch lever.

In testimony whereof I affix my signature 1n presence of two witnesses.

WILLIAIW ELLIS.

Witnesses:

IRA SmoK, ANNA SmoK.

Copies cf this patent may be obtained for five cents each, by addressingthe "Commissioner of Patent: Washingtom D. C."

